Location data · Baden-Württemberg
Sun hours in Stuttgart
How sunny is Stuttgart? Over a year the sun delivers 1,412 kilowatt-hours onto every square metre here — in June roughly 4 times as much per day as in December. “Sun hours” has two meanings: the weather report counts how long the sun shines. For solar power what matters is how much energy arrives — and that is what this page shows, as peak sun hours (hours of full sun power).
For solar planning this means: an optimally tilted, south-facing array (35°) harvests an annual average of 3.87 peak sun hours per day in Stuttgart. In 9 out of 10 years at least 1,320 kWh/m² are reached. All values are computed from this location’s satellite hourly data, not estimated.
- Annual average (PSH)
- 3.87 kWh/m²/d
- P90 annual total
- 1,320 kWh/m²
- Optimal tilt
- 35°
- Terrain horizon max.
- 12.2°
Sun hours per month
| Month | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| PSH/day (35° south) | 1.59 | 2.62 | 4.02 | 5.05 | 5.15 | 5.78 | 5.72 | 5.22 | 4.63 | 3.18 | 1.95 | 1.44 |
| P90 | 1.20 | 1.83 | 3.11 | 3.95 | 4.51 | 5.08 | 5.00 | 4.39 | 3.93 | 2.48 | 1.45 | 1.00 |
Daily average per month in kWh/m² at 35° tilt, south-facing, including the terrain horizon of Stuttgart. P90 = reached in 9 out of 10 years.
Optimal tilt angle in Stuttgart
The annual optimum for Stuttgart is 35° south; anything between 24° and 50° counts as equivalent (below 2% difference). For winter operation (off-grid) 65° is optimal, for summer use 20°. Flat-laid modules lose 15.0 % versus the optimum. Adjusting twice a year would add 2.8 % here, monthly adjustment 3.4 % — only relevant for adjustable mounts.
Is a balcony solar kit worth it in Stuttgart?
A vertical south-facing railing in Stuttgart harvests 994 kWh/m² per year — 70 % of what an optimally tilted 35° panel yields at the same spot. December softens the penalty: with the low winter sun, the vertical plane reaches 106 % of the 35° December value, computed from the same hourly data with its own plane transposition. Open the balcony solar calculator with these coordinates →
Neighbouring places compared
- Ludwigsburg3.87 kWh/m²/d13 km
- Sindelfingen3.85 kWh/m²/d15 km
- Bietigheim-Bissingen3.86 kWh/m²/d19 km